Mafia II

Driving to Leo's -

Whilst the other two solutions are great, I did not realise until looking it up that I could sprint. As soon as you leave the hotel, have your finger on LB and sprint straight across the road to smash the window of the car there and get in with B. As soon as you in the car, hold down RT to start the car up a.s.a.p. and get going. You'll automatically be facing the right direction for the best route.
Key thing here is to not go too fast on the turning bits and shorter roads, whilst it feels like you're wasting time, overshooting/drifting too much will cause mayhem and destroy you. There are a couple of corners that you can go over paths and grass to cut a couple of seconds short but be careful not to run over people and get the police shoot at you because they won't give up and you won't be able to open the door to the house if you get there. No worries if you crash or something and get the police after you in other cases - you can outrun them and get them off you.
When you get up the last hill, be careful about the turn in to Leo's mansion - you need enough speed to crash through the gate and you need to be aware of oncoming traffic. As soon as you're through, stop, get out of the car and SPRINT (LB) to the front door. As soon as you're there a cut scene will occur.

P.s. if you're failing and crash/overshoot/or else, just hit start and retry since you won't make it and you'll be wasting valuable minutes of your life! You pretty much have to drive this route perfectly in order to make it and it took me a good 50+ retries and more than a couple of hours...

Saving Leo quietly - The above solution tell you how to do it perfectly. As soon as you reach the wash basket you'll be set but if you get caught out somehow and Henry finds you, just retry the mission. You won't get the achievement any other way and when you retry you'll be back in his bedroom, ready to open the balcony doors.

That's all the extra comments I could think of to make for you guys!

Not missable

Chapter 11: A Friend of Ours

Warning Leo

With Clemente gone, Henry will come to you asking to join Falcone. Drive with him to Falcone's bar and a deal will be made. In order to join the family, Henry will be tasked with killing off Leo. Your task is to warn Leo before Henry makes it there.

Since Henry will have taken your car, you need to get in one that can reach very fast speeds. If your ride can't reach at least 60 miles per hour, then it won't make it to Leo's the short amount of time. You also want to be careful to not alert the cops. You will be unable to reach your target if you have any police on your tail.

Escape

Once you've got Leo on your side, attempt to sneak him out while avoiding Henry and his help. It's not mandatory that you escape; you can simply hide until things blow over.

Once the coast is clear, hop into one of Leo's cars and drive him to the way point. Since he'll leave the ride with you, feel free to take the vehicle back to your private garage.

Marital Affairs

Upon returning home, you'll get a call from your sister to look for her husband, Eric. Follow your waypoint and you'll locate him in an apartment.

Seems like he's cheating on your sister. Beat up Eric in a one-on-one fist fight. The same standard tactics apply here of dodging and counter attacking.

Luck of the Irish

Even after returning home you'll be attacked by the Irish mob. They will burn down your house, destroying everything: your home, clothes, weapons, and all of your cash. Your cars will remain, but you'll only be able to access them from another garage.

Since you're unarmed, quickly run and steal a car. The enemies are on foot, so ignore them and race to Joe's. He'll supply you with a gun and some clothing. He's changed his apartment a bit, so be sure to take the time and pick up some of his collectables.

Once geared up, head to the Irish's pub. The entire gang--even the bar tender--will start firing at you and Joe. Take out the enemies on the right at firt, then take cover behind the bar. Even more enemies will appear. Thankfully, the bartender will have dropped a powerful shotgun you can use to execute the remaining enemies.

The remaining gang will take off. Chase after them in your car, but be warned that the police are hot on your tail. You can actually use this to your advantage by luring the police into a three way battle, destroying the remains of the Irish. Once the enemies are dead, you'll have a new place to stay: Marty's apartment.

Source: http://www.gamespot.com/features/6274410/p-12.html